Power=potantial difference times what

The slotted link is pinned at o, and as a result of rotation it drives the peg p along the horizontal guide. compute the magnitude of the velocity and acceleration of p along the horizontal guide. compute the magnitudes of the velocity and acceleration of p as a function of θ if θ=(3t) rad, where t is measured in seconds.

Will you chech and finish these for me, because i am stumped with them.

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity